CN106300917A - Negative-feedback circuit - Google Patents
Negative-feedback circuit Download PDFInfo
- Publication number
- CN106300917A CN106300917A CN201610883434.XA CN201610883434A CN106300917A CN 106300917 A CN106300917 A CN 106300917A CN 201610883434 A CN201610883434 A CN 201610883434A CN 106300917 A CN106300917 A CN 106300917A
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- outfan
- negative
- node
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The open a kind of negative-feedback circuit of the present invention, including the first operational amplifier, the second operational amplifier and PWM controller, the outfan of described second operational amplifier is connected to the error amplifier in-phase input end EA+ of PWM controller by the 8th resistance, the control wide to carry out PWM tune.Meanwhile, the outfan of described second operational amplifier is also by the agitator timing resistor pin RT of the 9th resistance Yu PWM controller, to carry out the control of frequency modulation.Above-mentioned negative-feedback circuit can make output voltage when excursion is wider, and output voltage is relatively stable and dead-beat.
Description
Technical field
The present invention relates to a kind of negative-feedback circuit, particularly to a kind of negative-feedback circuit being applied in Switching Power Supply.
Background technology
Switching Power Supply has multiple power circuit topology, and the circuit topology that the most conventional efficiency is higher is LLC circuit topology,
Including half-bridge LLC circuit topology, full-bridge LLC circuit topology etc..LLC circuit topology can realize higher conversion efficiency, circuit
Operating frequency can be greatly improved, and then volume and the cost of power supply can be substantially reduced.LLC circuit topology is to utilize
The method of the operating frequency adjusting circuit realizes the adjustment of output voltage, and the gain ranging of its circuit is narrow, especially exists
Under the output condition of small area analysis, its gain ranging being input to output is narrower, therefore for wide scope input and wide range output
Switching Power Supply, LLC circuit by adjust operating frequency can not realize stablizing of output voltage.In order to realize wide range output
Purpose, can be realized by the operating frequency and dutycycle two ways that adjust power supply, hereinafter referred to as modulating frequency and width control mode,
But owing to LLC circuit its Controlling model when different operating frequencies is different, therefore it is difficulty with at whole output voltage
Steady operation in scope and loading range.
Summary of the invention
Embodiment of the present invention technical problem to be solved there are provided a kind of wider in output voltage excursion
In the case of the relatively stable and dead-beat negative-feedback circuit of output voltage.
A kind of negative-feedback circuit provided by the present invention, controls including the first operational amplifier, the second operational amplifier and PWM
Device processed, the inverting input of described first operational amplifier connects output voltage V-OUT, described first computing by the with resistance
The in-phase input end of amplifier connects reference voltage V-SET, the anti-phase input of described first operational amplifier by the second resistance
Hold the node between the first resistance to pass sequentially through the 3rd resistance and the first electric capacity be connected to the outfan of the first operational amplifier,
Node between described first electric capacity and the outfan of the first operational amplifier is connected to the first resistance and by the second electric capacity
Node between three resistance, the node between outfan and first electric capacity of described first operational amplifier is by the 4th resistance even
Being connected to the normal phase input end of the second operational amplifier, the inverting input of described second operational amplifier is connected by the 5th resistance
The current sampling signal of transformer primary side, the outfan of described second operational amplifier is connected to the second computing by the 7th resistance
The inverting input of amplifier, the node between described 7th resistance and the outfan of the second operational amplifier passes through the 9th resistance
Being connected with the agitator timing resistor pin of PWM controller, the outfan of described second operational amplifier is also by the 8th resistance
It is connected with the error amplifier homophase input pin of PWM controller.
Wherein, the inverting input of described operational amplifier D2 connects with reference to d. c. voltage signal also by the 6th resistance.
In negative-feedback circuit of the present invention, the outfan of described second operational amplifier is connected to by the 8th resistance
The error amplifier in-phase input end EA+ of PWM controller, the control wide to carry out PWM tune.Meanwhile, described second operation amplifier
The outfan of device is also by the agitator timing resistor pin RT of the 9th resistance Yu PWM controller, to carry out the control of frequency modulation.On
Stating negative-feedback circuit can make output voltage when excursion is wider, and output voltage is relatively stable and dead-beat.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings；
Fig. 1 is the circuit diagram of the better embodiment of negative-feedback circuit of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
First, before embodiment is described, it is necessary to some herein presented terms are explained.Example
As:
If occurring herein using the term such as " first ", " second " to describe various element, but these elements should not
Limited by these terms.These terms are only used for distinguishing an element and another element.Therefore, " first " element can also
It is referred to as " second " element without departing from the teachings of the present invention.
In addition, it is to be understood that when mentioning that an element " connects " or during " coupled " to another element, it can be direct
Ground connects or is directly coupled to another element or can also there is intermediary element.On the contrary, when mentioning an element " directly
Connect " or " directly couple " to another element time, the most there is not intermediary element.
The various terms occurred in this article are used only for describing the purpose of specific embodiment and being not intended as this
The restriction of invention.Unless context clearly dictates otherwise, then singulative is intended to also include plural form.
When using term " to include " in this manual and/or time " including ", these terms specify described feature, whole
The existence of body, step, operation, element and/or parts, but be also not excluded for more than one other feature, entirety, step, operation,
The existence of element, parts and/or its group and/or additional.
About embodiment:
Refer to the circuit diagram that Fig. 1, Fig. 1 are the better embodiment of negative-feedback circuit of the present invention, described negative-feedback circuit
Better embodiment include operational amplifier D1, D2 and PWM controller D3, the inverting input of described operational amplifier D1 lead to
Crossing resistance R1 and connect output voltage V-OUT, the in-phase input end of described operational amplifier D1 connects reference voltage by resistance R2
V-SET。
Node between inverting input and the resistance R1 of described operational amplifier D1 passes sequentially through resistance R3 and electric capacity C1
Being connected to the outfan of operational amplifier D1, the node between described electric capacity C1 and the outfan of operational amplifier D1 passes through electric capacity
C2 is connected to the node between resistance R1 and R3.
Node between outfan and the electric capacity C1 of described operational amplifier D1 is connected to operational amplifier by resistance R4
The normal phase input end of D2.The inverting input of the described operational amplifier D2 current sample by the former limit of resistance R5 connection transformer
Signal IP1, connects with reference to d. c. voltage signal VREF also by resistance R6.The outfan of described operational amplifier D2 passes through resistance
R7 is connected to the inverting input of operational amplifier D2.Node between described resistance R7 and the outfan of operational amplifier D2 leads to
Crossing resistance R9 to be connected with the agitator timing resistor pin RT of PWM controller D3, the outfan of described operational amplifier D2 is the most logical
Cross resistance R8 to be connected with the error amplifier in-phase input end EA+ of PWM controller D3.In other embodiments, if operation amplifier
Device D2 precision is higher, also can omit resistance R6 and with reference to d. c. voltage signal.
In present embodiment, the outfan of described operational amplifier D2 is connected to the mistake of PWM controller D3 by resistance R8
Difference amplifier in-phase input end EA+, the control wide to carry out PWM tune.Meanwhile, the outfan of described operational amplifier D2 also by
Resistance R9 and the agitator timing resistor pin RT of PWM controller D3, to carry out the control of frequency modulation.Negative feedback of the present invention
Circuit can make output voltage when excursion is wider, and output voltage is relatively stable and dead-beat.
These are only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilize the present invention
Equivalent structure or equivalence flow process that description and accompanying drawing content are made convert, or are directly or indirectly used in other relevant technology
Field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (2)
1. a negative-feedback circuit, it is characterised in that: described negative-feedback circuit includes the first operational amplifier, the second operation amplifier
Device and PWM controller, the inverting input of described first operational amplifier connects output voltage V-OUT, institute by the with resistance
The in-phase input end stating the first operational amplifier connects reference voltage V-SET, described first operational amplifier by the second resistance
Inverting input and the first resistance between node pass sequentially through the 3rd resistance and the first electric capacity is connected to the first operation amplifier
The outfan of device, the node between described first electric capacity and the outfan of the first operational amplifier is connected to by the second electric capacity
Node between one resistance and the 3rd resistance, the node between outfan and first electric capacity of described first operational amplifier passes through
4th resistance is connected to the normal phase input end of the second operational amplifier, and the inverting input of described second operational amplifier is by the
The current sampling signal on the five former limits of resistance connection transformer, the outfan of described second operational amplifier is connected by the 7th resistance
Node between the inverting input of the second operational amplifier, described 7th resistance and the outfan of the second operational amplifier leads to
Crossing the 9th resistance to be connected with the agitator timing resistor pin of PWM controller, the outfan of described second operational amplifier is the most logical
Cross the 8th resistance to be connected with the error amplifier homophase input pin of PWM controller.
2. negative-feedback circuit as claimed in claim 1, it is characterised in that: the inverting input of described operational amplifier D2 is the most logical
Cross the 6th resistance to connect with reference to d. c. voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610883434.XA CN106300917A (en) | 2016-10-09 | 2016-10-09 | Negative-feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610883434.XA CN106300917A (en) | 2016-10-09 | 2016-10-09 | Negative-feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106300917A true CN106300917A (en) | 2017-01-04 |
Family
ID=57718061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610883434.XA Pending CN106300917A (en) | 2016-10-09 | 2016-10-09 | Negative-feedback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106300917A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007244088A (en) * | 2006-03-08 | 2007-09-20 | Mitsumi Electric Co Ltd | Power supply control circuit and power supply device |
| CN101056061A (en) * | 2006-04-14 | 2007-10-17 | 艾默生网络能源系统有限公司 | Method and system for modulating and controlling resonant circuit |
| CN101079577A (en) * | 2006-05-24 | 2007-11-28 | 英特赛尔美国股份有限公司 | Voltage regulator having current canceling compensation |
| CN201956897U (en) * | 2010-09-19 | 2011-08-31 | 石家庄国耀电子科技有限公司 | Logical link control (LLC) topology circuit output overcurrent constant current protection circuit for switching power supply |
| CN102739052A (en) * | 2012-07-18 | 2012-10-17 | 华为技术有限公司 | Control method and device |
| CN206117481U (en) * | 2016-10-09 | 2017-04-19 | 深圳市钜能科技有限公司 | Negative feedback circuit |
-
2016
- 2016-10-09 CN CN201610883434.XA patent/CN106300917A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007244088A (en) * | 2006-03-08 | 2007-09-20 | Mitsumi Electric Co Ltd | Power supply control circuit and power supply device |
| CN101056061A (en) * | 2006-04-14 | 2007-10-17 | 艾默生网络能源系统有限公司 | Method and system for modulating and controlling resonant circuit |
| CN101079577A (en) * | 2006-05-24 | 2007-11-28 | 英特赛尔美国股份有限公司 | Voltage regulator having current canceling compensation |
| CN201956897U (en) * | 2010-09-19 | 2011-08-31 | 石家庄国耀电子科技有限公司 | Logical link control (LLC) topology circuit output overcurrent constant current protection circuit for switching power supply |
| CN102739052A (en) * | 2012-07-18 | 2012-10-17 | 华为技术有限公司 | Control method and device |
| CN206117481U (en) * | 2016-10-09 | 2017-04-19 | 深圳市钜能科技有限公司 | Negative feedback circuit |
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Application publication date: 20170104 |